Biofuel systems for quality-conscious customers

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Wood store agitator type Rotag Twin Heat Rotag agitator is available in 2 different sizes, Rotag 2500 with a diameter of 2.5 meters and Rotag 4500 with a diameter of 4.5 meters. The Rotag agitator is supplied for use with the Combi type MCS and industrial plants CS, and works automatically with the boiler. The fuel is loaded directly on top of the Rotag where a large plate with stirrer springs slowly rotates and draws fuel into the delivery auger which connects to the boiler. Rotag 2500 and 4500 is suitable for fuels such as wood chips, shavings, sawdust and wood pellets Heavy chain drive Heavy-duty delivery auger Spring loaded lid with an electrical switch, which stops the delivery auger in case of fuel piling up Combi system type MCS Installed with Rotag 2500 16
Lime doser for firing with grains and other fuels Can be used with various silo systems and auger conveyors can also be used as a traditional solid fuel boiler. If used in this way, it is particularly advantageous to have an accumulation tank (1000–2000 litres) which is heated up in one go. COMBUSTION PRINCIPLE It takes more than perfect combustion to achieve a high rate of efficiency. The heat must be removed from the flue gasses. TWIN HEAT has solved this issue by designing a boiler with reversing flame in the boiler chamber and two flue passes in the heat exchanger. This produces excellent heat transfer to the water in the boiler and thereby a low flue temperature to the chimney. In addition, this design has very low environmental impact, as the residue from the combustion ends in the right place – that is, in the flue gas box and not in the air. This special combustion technology is divided into three phases: gasification, combustion and after-burning. The preheated current of air is injected into the entire circumference of the combustion tube at a right angle to the gas flow, resulting in excellent combustion, even at low boiler outputs. MANUAL FIRING IN COMBI SYSTEMS Manual firing with wood logs in the Variant boiler can be done in two ways. Combi firing is an option, allowing you to supplement with wood logs while the stoker is running. A few wood logs (depending on the output) are placed in the boiler. The wood is automatically lit by the flame heat from the burner tube. The oxygen sensor will automatically register that logs has been loaded into the boiler, thereby saving on the stoker fuel in the storage. Pure manual firing in the boiler, where the stoker has been stopped. The Variant boiler is fitted with a draught regulator and draught dampers in the boiler door so it OXYGEN CONTROL The object of the oxygen control is to optimise the relationship between combustion air and fuel as well as to regulate the output of the burner steplessly after the heat consumption. This ensures that the burner operates at its optimum, irrespective of the quality of the fuel and the heat consumption. Many burners that are controlled traditionally often have to change between operation and pause mode, resulting in energy loss. With our design, the burner is in continuous operation with outputs from 20% of full load, whereby a better and more economic combustion is achieved, as the breaks are avoided (modulating operation). The control unit has a large display showing temperature, boiler output, flue oxygen content and operating condition. In addition, it is pre-set for wood pellets, grains and wood chips. Moreover, users have the option of setting up fixed programs where they can adjust all relevant parameters according to requirements. In the event of an alarm, the error is described in the display. This control unit is one of the most user-friendly currently on the market. SAFETY EQUIPMENT As standard, all TWIN HEAT systems are fitted with a sprinkler system and “pressure tubes” preventing an accumulation of gas in the fuel storage. The sprinkler system can be activated in connection with, for instance, power failure. After activation, the water is quickly turned off again automatically so as to avoid “flooding”. All systems stop automatically if they run out of fuel. BYPASS SYSTEM Our Variant boiler is designed with a damper in the flue gas box of the boiler (bypass), making it possible to adjust the flue temperature to the season. In modern boiler systems, the flue is often cooled down to about 150–180 °C at full load and that means that the flue temperature if often too low at low outputs, usually during spring and autumn. TWIN HEAT has solved this issue by adding the bypass system to the Variant boiler. If the damper is opened completely – typically during the summer – the flue is forced directly out to the chimney, thereby avoiding the heat exchanger. 17
Page 1 and 2: Biofuel systems for quality-conscio
Page 3 and 4: TWINHEAT - Cpi12 Biofuel burner for
Page 5 and 6: Technical data Output with wood pel
Page 7 and 8: Common for Combi systems type M, MC
Page 9 and 10: TYPE M with 800 & 1400 litre fuel s
Page 11 and 12: TYPE ME The ME system must be conne
Page 13 and 14: TYPE CS The large door of the boile
Page 15: QUATRO SILO TYPES 1 & 2 The Twin He
Page 20: TWINHEAT also supplies complete mob

Biofuel systems for quality-conscious customers

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